Question

Can I use boost::bind(mycallback, this, _1, _2) across C code?

Update

The short answer is no, boost bind does not return a function pointer, which can be called in C code, but a functor (C++ object with overloaded () operator) see answer below.

Answer 1

The best way to do what you want to do is to create a C callback that then calls the boost::function, which is stored in some sort of user memory with new.

Example:

void callFunction(void* data)
{

   boost::function<void(void)> *func = (boost::function<void(void)>* ) (data);
   (*func)();
   delete(func);
}

Then you simply pass this callback and set the user data(however it is specified in libev) to be a copy of your function allocated with new.

This is how you specify user data with libev:
http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#ASSOCIATING_CUSTOM_DATA_WITH_A_WATCH